Dbjvuirg-motjnt for the bowls of centrifugal machines



J. J. HAY.

DRIVING MOUNT FOR THE BOWLS 0F CENTRIFUGAL MACHINES.

APPLJCATION FILED IULYI4,1920. RENEWED JUNE 241192]. 1,388,339.

Patented Aug. 23, 1921.

UNITED STATES PATENT OFFICE.

JAMIE J. HAY, OF BELLOWS FALLS, VERMONT, ASSIGNOR TO VERMONT FARM MACHINE CORPORATION, OF BELLOWS FALLS, VERMONT, A CORPORATION DRIVING-MOUNT FOR THE BOWLS OF CENTRIFUGAL MACHINES.

Application fled July 14, 1920, Serial No. 396,155. Renewed June 24, 1921.

To all whom it may concern:

Be it known that 1, JAMES J. HAY, a citizen of the United States, residing at Bellows Falls, in the county of Windham and State of Vermont, have invented a certain new and useful Improvement in Driving- Mounts for the Bowls of Centrifugal Machines, of which the following is a full, clear, and exact description.

This invention relates to an improvement in the mountin and driving of centrifugal separator bow s, more particularly the bowls of centrifugal cream separators.

The invention consists of a base for the bowl having an upstanding central tubular stem, the lower portion of which next to the base is hushed with a cylindrical bushing, preferably of bronze, to receive the vertically arranged driving spindle which, preferabl has a frusto-oonical end which is provide with a transverse kerf or nick, the conical end of the spindle seating against the convex end of a step-member arran ed in the upper end of the bushing and pre erably made of bronze, and the kerf or nick of the spindle being engaged by a tongued plug arranged in such step-member, the bushing, ste and plug having a tight fit and being he d against relative movement by a transverse fastening engaging them wit the stem of the base, as I Wlll proceed now to explain and finally claim.

In the accompanying drawings illustrating the invention, in the several fi res of which like parts are similarly designated, Figure 1 is a vertical longitudinal section, partly in elevation. Fig. 2 is a similar sectional elevation, taken at right angles to the view shown in Fig. 1, substantially in the plane of line 2-2, Fig. 1, but showing the ton ed plug in elevatlon. Fig. 3 is a cross section on the line 3-3 of Fig. 1. Fig. 4 is a perspective view of the step-member and plu separated and detached.

1%16 base 1 may be of suitable construction to receive and support the bowl, not shown, and from this base rises a vertical hollow stem 2.

The lower portion of the stem 2 next to the base is provided with a cylindrical tubular bushing 3, preferably of bronze, to receive the u per end 4, preferably reduced as shown, 0 the bowl driving spindle 5. The tip 6 of the driving spindle is made in Specification of Letters Patent.

Patented Aug. 23, 1921.

Serial No. 480,193.

the form of a frustum of a cone, and is provided with a transverse kerf or nick 7 In the upper end of the bushing 3 is arranged a tubular step-member 8 having by preference a substantially flaring bore and having its bottom provided with a convex bell-mouthed construction 9 to engage the conical tip of the driving spindle. Within the bore of the step-member 8 is a plug 10 having the projecting tongue 11 which engages the kert or nick 7 in the tip of the driving spindle to form a driving connection for the bowl. The bushing, the step-memher and the plug are assembled with a tight fit, and they are secured within the stem and against relative movement therein by suitable means, such as the transverse pin 12. The plug 10 may be of steel; and its tongue is of less width than the step-member 8, but sufiiciently wide to aflord an eflicient driving connection with the spindle.

The plug 10 is a tapered plug, and the hole in th stepmember 8 is correspondingly tapered, so that in assembling the parts, the plug is driven solidly into the step-member and as far as the two tapers will allow. As compared with a straight cylindrical plug and a straight cylindrical hole in the stepmember. it is to be said that the tapered construction of this invention affords more nocurate centering of the plug inside of tho step-member and without the necessity and expense of extremely accurate sizing of these parts. Again. the tapered construction provides a greater solidity of the plug when driven into place and a correspondingly greater permanence after it is put into use and subjected to such intense vibration as is the case in separator bowls running at high speed on this step bearing. Furthermore, as a machining operation. the holding of a tapered plug by driving it into a tapered hole in the milling fixture, or jig, while slabbing oil the two sides to form the tongue 11, insures having the tongue absolutely in the center of the plug; whereas a straight plug would have to be clamped between jaws which are always more or less inaccurate and subject to variation. It is quite neces sary that the flat driving tongue be in the center of the plug in order that each side or corner of the blade shall touch each side of the kerf 7 in the spindle and give equal driving pressure. If driven from one side, the

bowl at high speed shows this unevenness by not running smoothly; it will inevitably vibrate and never run as it should.

The construction and assemblage of the several parts shown and described affords a more perfect mounting and driving device than any other that has come within my observation. The combination of the steel driving devices 10 and 11 surrounded by the non-rusting step-member 8 and the nonrusting bushing 3 that surrounds the body of the upper end of the steel drivingspindle, admits of closer fitted joints, and avoids the danger of their becoming rusted together, and also the danger of seizing together from lack of lubrication, which is a common fault in this part of many cream separators as ordinarily used.

The invention is susceptible of variations in the details of construction and arrangement within the principle and scope of the claims following.

What I claim is i 1. The combination with the base and hollow] stem of a rotary device, of a driving mount therefor comprising a bushing arranged in said stem, a step-member arranged in said bushing and having a flaring mouth, and a plug immovably arranged in said step-member and provided with a tongue.

2. The combination with the base and hollow stem of a rotary device, of a driving mount therefor comprising a bushing arranged in said stem, a step-member arranged in said bushing and having a flaring mouth, a plug iinmovably arranged in said step-member and provided with a tongue and a pin passed through the stem, bushing, step-member and plug to restrain them from relative movement.

3. The combination with the base and hollow stem of a rotary device, of a driving spindle having a tapered tip provided with a transverse kerf or nick, a bushing in the stem surrounding said spindle, a bell-' spindle.

5. The combination with the base and hollow stern of" a rotary device, of a driving spindle having a tapered tip provided with a transverse kerf or nick, a'bushing in the stem surrounding said spindle, a bellmouthed step-member in which the spindle has a step bearing, and a plug immovably inserted in the step-member and having a projecting tongue for engaging the kerf or nick in the tip of the spindle.

G. The combination with the base and hollow stem of a centrifugal bowl separator, of a iard metal bushing in the lower end of the stem, a hard metal: tubular step-member having a flaring bore and tightly fitted in said bushing, a plug tightly fitted in said step-member and having a tongue extending beyond it, a transverse pin engaging the stem, bushing, step-member and plug, and a driving spindle having its upper end surrounded by and engaging the bushing anda frustoconicol tip transversely: kerfed or nicked and seated in the step-member and engaged by the tongue. 1

In testimony whereof I have hereunto set my hand this 12th day of July, A. D. 1920.

- JAMES J. HAY.

\Vitnesses:

M. J. PIKE, E. VIRGVIL. 

